The fitness mad neoprene dumbbells have a neoprene coating surrounding the iron weight neoprene is an extremely durable material more durable than rubber these weights are made to last and are perfect for studio use for home gyms and pt s key features of the fitness mad neoprene dumbbells the fitness mad neoprene dumbbells are ideal for aerobic and fitness training flat bottoms prevent weights from rolling away available in the following sizes 0 5kg 1 0kg 1 5kg 2 0kg 3 0kg 4